Cloud Spanner API - Class Google::Cloud::Spanner::Range (v2.20.0)

Reference documentation and code samples for the Cloud Spanner API class Google::Cloud::Spanner::Range.

Range

Represents a range of rows in a table or index. A range has a start key and an end key. These keys can be open or closed, indicating if the range includes rows with that key.

Inherits

  • Object

Example

require "google/cloud/spanner"

spanner = Google::Cloud::Spanner.new

db = spanner.client "my-instance", "my-database"

key_range = db.range 1, 100
results = db.read "users", [:id, :name], keys: key_range

results.rows.each do |row|
  puts "User #{row[:id]} is #{row[:name]}"
end

Methods

#begin

def begin()

Returns the object that defines the beginning of the range.

#end

def end()

Returns the object that defines the end of the range.

#exclude_begin?

def exclude_begin?() -> Boolean

Returns true if the range excludes its beginning value.

Returns
  • (Boolean)

#exclude_end?

def exclude_end?() -> Boolean

Returns true if the range excludes its end value.

Returns
  • (Boolean)

#initialize

def initialize(beginning, ending, exclude_begin: false, exclude_end: false) -> Range

Creates a Spanner Range. This can be used in place of a Ruby Range when needing to exclude the beginning value.

Parameters
  • beginning (Object) — The object that defines the beginning of the range.
  • ending (Object) — The object that defines the end of the range.
  • exclude_begin (Boolean) (defaults to: false) — Determines if the range excludes its beginning value. Default is false.
  • exclude_end (Boolean) (defaults to: false) — Determines if the range excludes its ending value. Default is false.
Returns
  • (Range) — a new instance of Range
Example 
require "google/cloud/spanner"

spanner = Google::Cloud::Spanner.new

db = spanner.client "my-instance", "my-database"

key_range = Google::Cloud::Spanner::Range.new 1, 100
results = db.read "users", [:id, :name], keys: key_range

results.rows.each do |row|
  puts "User #{row[:id]} is #{row[:name]}"
end